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Ive bought a half dozen over the last couple years. They are just as bright as any other Uranium glass marbles and other stuff I've bought.

The guy is super nice and easy to deal with, he cut down a couple 4" ones to a pair of 2" tubes or me late last year.

I'm working on a night light with a 405nm laser in the middle under a 1" uranium glass marble.
The marble will be held in place by 4 of these tubes cut to 2" and the mirrored wood top The tubes have 405nm LED's on each end. Every thing is done other than assembly and the on/off switches.

LED section for tubes is below (somehow ended upside down, sorry)

The tubes light great if you shine directly on it. Shining through it, you mostly get spray from the edges of the laser to light it up.